Question

if sinA =1 then value of cos A is ? ​

Answer 1

Answer:

$0$

Step-by-step explanation:

$if \: \: \sin(A) = 1$

$A = 90°$

$then \: \: \cos(A) = \cos(90°)$

$= 0$

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Answer 2

Answer:

0

Step-by-step explanation:

sinA= 1

(I have included an attachment for better clarity)

now, there are two approaches to this problem

approach 1:

find angle and the find cos of that angle

but you can't always use this; especially when the trigonometric value given is something you don't know, something different from the usual trigonometric values obtained from the usual angles l, like 0,30,45,60,and 90

approach 2:

use the identity that (sinx)^2 + (cosx)^2 =1

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